Instruction Manual

HI 9023C - HI 9023CNHI 9024C - HI 9025CHI 9110 - HI 9210

HI 9210N

Portable WaterproofpH Meters

M a n u f a c t u r e r s s i n c e 1 9 7 8These Instruments are in

Compliance with the CE Directives

2

PRELIMINARY EXAMINATION ..................................................... 3

GENERAL DESCRIPTION ............................................................ 3

FUNCTIONAL DESCRIPTION HI 9023C & HI 9023CN .................. 5

SPECIFICATIONS HI 9023C & HI 9023CN ................................. 6

FUNCTIONAL DESCRIPTION HI 9024C & HI 9025C ..................... 7

SPECIFICATIONS HI 9024C & HI 9025C .................................... 8

FUNCTIONAL DESCRIPTION HI 9110 .......................................... 9

FUNCTIONAL DESCRIPTION HI 9210 & HI 9210N .................... 10

SPECIFICATIONS HI 9110, HI 9210 & 9210N ......................... 11

OPERATIONAL GUIDE ............................................................. 12

pH CALIBRATION ................................................................... 16

pH VALUES AT VARIOUS TEMPERATURES ................................ 24

TROUBLESHOOTING GUIDE ..................................................... 25

ELECTRODE CONDITIONING AND MAINTENANCE ......................... 26

TAKING REDOX MEASUREMENTS (HI 9023C & HI 9025C only) . 29

BATTERY REPLACEMENT & AUTO-OFF ...................................... 30

ACCESSORIES ....................................................................... 31

ELECTRODE APPLICATION REFERENCE GUIDE ............................. 37

WARRANTY .......................................................................... 38

CE DECLARATION OF CONFORMITY ......................................... 39

Dear Customer,

Thank you for choosing a Hanna Product. Please read thisinstruction manual carefully before using the instrument. It willprovide you with the necessary information for a correct use of theinstrument, as well as a precise idea of its versatility. If you requirefurther technical information, do not hesitate to e-mail us attech@hannainst.com.

These instruments are in compliance with the directives.

TABLE OF CONTENTSTABLE OF CONTENTSTABLE OF CONTENTSTABLE OF CONTENTSTABLE OF CONTENTS

3

These waterproof Hanna instruments are heavy-duty pH metersdesigned to provide laboratory results and accuracy under harshindustrial conditions.

HI 9023C, pH/mV/°C meter utilizes an advanced customized micro-processor. The meter has three memorized buffer values (4.01, 7.01and 10.01) and automatic buffer recognition to avoid errors duringcalibration. There are no trimmers, making calibration an easyprocess, even for non-technical personnel. Temperature effects areautomatically compensated for, or can be manually adjusted. WithHI 9023CHI 9023CHI 9023CHI 9023CHI 9023C you can also measure ORP (Oxidation Reduction Poten-tial) or Ion Specific. Millivolt measurements automatically switch from0.1 to 1 mV resolution when the reading reaches 400mV.

HI 9023C is supplied with HI 1230B combination double-junction gelpH electrode, HI 7669/2W temperature probe, pH 4.01 and 7.01 (20mL each) buffer solutions, sample vessel, 1.5V AA size batteries (4each) and a rugged carrying case.

HI 9023CN, pH/mV/°C meter utilizes an advanced customizedmicroprocessor. The meter has three memorized buffer values (4.01,7.01 and 10.01) and automatic buffer recognition to avoid errorsduring calibration. Temperature effects are automatically compen-sated for.

HI 9023CN is supplied with HI 1217D 4-in-1 amplified, gel pH/ Celectrode, pH 4.01 and 7.01 (20 mL each) buffer solutions, samplevessel, 1.5V AA size batteries (4 each) and a rugged carrying case.

HI 9024C and HI 9025C are pH/°C meters with a built-in micropro-cessor. A large dual-level LCD displays the pH and temperaturesimultaneously. The display has graphic symbols to make the calibra-tion procedure easy to follow. The meters have 5 memorized buffer

Remove the instrument from the packing material and examine itcarefully to make sure that no damage has occurred during shipping.If there is any noticeable damage, notify your Dealer immediately.

Note: Save all packing materials until you are sure that the instru-ment functions correctly. Any damaged or defective item mustbe returned in its original packing materials together with thesupplied accessories.

PREL IMINARY EXAMINATIONPRELIMINARY EXAMINATIONPRELIMINARY EXAMINATIONPRELIMINARY EXAMINATIONPRELIMINARY EXAMINATION

GENERAL DESCRIPTIONGENERAL DESCRIPTIONGENERAL DESCRIPTIONGENERAL DESCRIPTIONGENERAL DESCRIPTION

4

values (4.01, 6.86, 7.01, 9.18 and 10.01), buffer recognition toavoid errors during calibration and automatic temperature compensa-tion. You can use HI 9025C with ORP (Oxidation Reduction Potential)or Ion Specific Electrodes. Millivolt measurements automatically switchfrom 0.1 to 1 mV resolution when the reading reaches 400 mV. Toinsure trouble-free operation, the meter's circuitry comes with built-inprotection against electromagnetic interference.

HI 9024C and HI 9025C are supplied with HI 1230B combinationdouble-junction, gel pH electrode, HI 7669/2W temperature probe,pH 4.01 and 7.01 (20 mL each) buffer solutions, sample vessel, 1.5VAA size batteries (4 each) and a rugged carrying case.

HI 9110 pH meter has simple manual temperature compensationand calibration which make this meter easy to use in laboratory andfield. The calibration trimmers are sealed behind a protective cover sothat they cannot be accidentally moved or readjusted by unauthorizedpersons.

HI 9110 is supplied with FC 100B combination double-junction,refillable pH electrode, calibration screwdriver, 1.5V AA size batteries(4 each) and a soft carrying case.

HI 9210 pH meter has simple manual temperature compensationand calibration with only two buttons, making it simple to use foreven non-technical personnel. The calibration trimmers are sealedbehind a protective cover so that they cannot be accidentally moved orreadjusted by unauthorized persons.

HI 9210 is supplied with HI 1230B combination double-junction, gelpH electrode, calibration screwdriver and 1.5V AA size batteries (4each).

HI 9210N pH/°C meter measures both pH and temperature. It hasonly two buttons, making it simple to use for even non-technicalpersonnel. The calibration trimmers are sealed behind a protectivecover so that they cannot be accidentally moved or readjusted byunauthorized persons.

HI 9210N is supplied with HI 1217D 4-in-1, gel, amplified pH/ Celectrode, calibration screwdriver and 1.5V AA size batteries (4 each).

5

1) Electrode connector (BNC for HI 9023C and DIN for HI 9023CN)2) Temperature probe socket (HI 9023C only)3) Liquid Crystal Display4) CAL key to enter or exit calibration mode5) CFM key to confirm calibration6) °C and C C C C C keys for manual temperature setting (HI

9023C only)7) ON/OFF key to turn the instrument on or off8) RANGE key to select pH, C or mV9) Low battery indicator (additional decimal point)

10) Mode indicator

FUNCTIONAL DESCRIPTIONFUNCTIONAL DESCRIPTIONFUNCTIONAL DESCRIPTIONFUNCTIONAL DESCRIPTIONFUNCTIONAL DESCRIPTIONHI 9023C & HI 9023CNHI 9023C & HI 9023CNHI 9023C & HI 9023CNHI 9023C & HI 9023CNHI 9023C & HI 9023CN

6

SPECIFICATIONS HI 9023CSPECIFICATIONS HI 9023CSPECIFICATIONS HI 9023CSPECIFICATIONS HI 9023CSPECIFICATIONS HI 9023C& HI 9023CN& HI 9023CN& HI 9023CN& HI 9023CN& HI 9023CN

HI 9023C HI 9023CN

Range 0.00 to 14.00 pH±399.9 mV (ISE); ±1999 mV (ORP)

0.0 to 100.0 C 0.0 to 70.0 C

Resolution 0.01 pH0.1 mV (ISE); 1 mV (ORP)

0.1 C

Accuracy ±0.01 pH(@20°C/68°F) ±0.2 mV (ISE); ±1 mV (ORP)

±0.4 C ±0.5 C

Typical EMC ±0.02 pHDeviation ±0.2 mV; ±1 mV

±0.2 C ±0.5 C

Calibration Automatic with 3 memorized standardbuffers (4.01, 7.01, 10.01)

Temperature Automatic or manual AutomaticCompensation 0 to 100 C (32-212 F) 0 to 70 C (32-158 F)

Electrode HI1230B plastic body, HI1217D plastic body,combination pH, BNC 4-in-1 gel pH/ C, DIN1 m cable (included) 1 m cable (included)

Temperature Probe HI 7669/2W (incl.) not necessary

Input Impedance 1012 Ohm

Battery Type & Life 4x1.5V, AA size (alkaline batteries)approx. 400 hours of continuous use

auto-shut off after 10 minutes of non-use

Environment 0 to 50 C (32 to 122 F); 100% RH

Dimensions 196x80x60 mm (7.7x3.1x2.4") (meter)340x230x80 mm (13.8x9x3.1") (kit)

Weight 425 g (15 oz.) (meter)1.3 Kg (3.0 lb.) (kit)

7

1) BNC electrode connector2) Temperature probe socket3) Liquid Cristal Display4) RANGE key to select pH or mV (HI 9025C only)5) ON/OFF key to turn the meter on or off6) CAL key to enter or exit calibration mode7) CFM key to confirm calibration8) °C and C C C C C keys for manual temperature setting, or

selecting pH buffer value9) MEM key to store pH value in memory

10) MR key to recall the stored value from memory11) User-friendly graphic symbols12) Primary display13) Secondary display

FUNCTIONAL DESCRIPTIONFUNCTIONAL DESCRIPTIONFUNCTIONAL DESCRIPTIONFUNCTIONAL DESCRIPTIONFUNCTIONAL DESCRIPTIONHI 9024C & HI 9025CHI 9024C & HI 9025CHI 9024C & HI 9025CHI 9024C & HI 9025CHI 9024C & HI 9025C

8

SPECIFICATIONS HI 9024C & HI 9025CSPECIFICATIONS HI 9024C & HI 9025CSPECIFICATIONS HI 9024C & HI 9025CSPECIFICATIONS HI 9024C & HI 9025CSPECIFICATIONS HI 9024C & HI 9025C

HI 9024C HI 9025C

Range 0.00 to 14.00 pH; 0.0 to 100.0 C— 0.0/±399.9 mV (ISE)— ±400/±1999 mV (ORP)

Resolution 0.01 pH; 0.1 C— 0.1 mV (ISE)— 1 mV (ORP)

Accuracy ±0.01 pH; ±0.5 C(@20°C/68°F) — ±0.2 mV (ISE)

Typical EMC ±0.01 pH; ±0.1 CDeviation — ±0.3 mV (ISE)

Calibration Automatic with 5 memorized standardbuffers (4.01, 6.86, 7.01, 9.18, 10.01)

Offset Calibration ±1 pH

Slope Calibration From 70 to 108%

Temperature Automatic or manual from 0 to 100 CCompensation (32 to 212 F)

Electrode HI 1230B pH electrode (included)

Temperature Probe HI 7669/2W (included)

Input Impedance 1012 Ohm

Battery Type & Life 4x1.5V, AA size (alkaline batteries)approx. 400 hours of continuous use

auto-shut off after 10 minutes of non-use

Environment 0 to 50 C (32 to 122 F); 100% RH

Dimensions meter: 196x80x60 mm (7.7x3.1x2.4")kit: 340x230x80 mm (13.8x9x3.1")

Weight meter: 425 g (15 oz.)kit: 1.3 Kg (3.0 lb.)

9

1) Battery cover2) BNC electrode connector3) Offset calibration trimmer4) Slope calibration trimmer5) Temperature setting trimmer6) Mode indicator7) Liquid Crystal Display8) ON/OFF key to turn the meter on or off9) pH/°C SET key to select pH measurement or for manual

temperature setting

RANGE0.00 TO 14.00 pHACCURACY±0.02pH

pH METER

pH

pH°C

SETHI 9110

67

8

9

2

1 3

4

5

Foodcare

ONOFF

FUNCTIONAL DESCRIPTION HI 9110FUNCTIONAL DESCRIPTION HI 9110FUNCTIONAL DESCRIPTION HI 9110FUNCTIONAL DESCRIPTION HI 9110FUNCTIONAL DESCRIPTION HI 9110

10

1) Battery cover2) Electrode connector (BNC for HI 9210 and DIN for HI 9210N)3) Offset calibration trimmer4) Slope calibration trimmer5) Temperature setting trimmer (HI 9210) or Temperature

Calibration (HI 9210N)6) Mode indicator7) Liquid Crystal Display8) ON/OFF key to turn the meter on or off9) RANGE key to visualize the temperature (HI 9210N) or for

manual temperature setting (HI 9210)

HI 9210NATCpH METER

ON/OFF

RANGE

RANGEpH:°C:

0.00 - 14.000.0 -70.0

pH

67

8

9

2

1 3

4

5

FUNCTIONAL DESCRIPTIONFUNCTIONAL DESCRIPTIONFUNCTIONAL DESCRIPTIONFUNCTIONAL DESCRIPTIONFUNCTIONAL DESCRIPTIONHI 9210 & HI 9210NHI 9210 & HI 9210NHI 9210 & HI 9210NHI 9210 & HI 9210NHI 9210 & HI 9210N

11

HI 9110 HI 9210 HI 9210N

Range pH 0.00 to 14.00 pH

°C — 0.0 to 70.0 CResolution pH 0.01 pH

°C — 0.1 C

Accuracy pH ±0.02 pH(@20°C/68°F) °C — ±0.5 C

Typical EMC pH ±0.05 pH ±0.02 pHDeviation °C — ±0.5 C

Calibration Manual 2 points through trimmers

Offset Calibration ±1 pH

Slope Calibration From 85 to 105% of nominal value

Temperature Manual 0 to 100 C Auto 0 to 70 CCompensation (32 to 212 F) (32 to 158 F)

Electrode FC 100B HI 1230B HI 1217DpH (incl.) pH (incl.) pH/ C (incl.)

Input Impedance 1012 Ohm

Battery Type 4x1.5 volt, AA size (alkaline batteries);Life 2000 hours of continuous use

Environment 0 to 50 C (32 to 122 F); 100% RH

Dimensions 196 x 80 x 60 mm (7.7 x 3.1 x 2.4")

Weight 320 g (11.3 oz.)

SPECIFICATIONS HI 9110, HI 9210SPECIFICATIONS HI 9110, HI 9210SPECIFICATIONS HI 9110, HI 9210SPECIFICATIONS HI 9110, HI 9210SPECIFICATIONS HI 9110, HI 9210& HI 9210N& HI 9210N& HI 9210N& HI 9210N& HI 9210N

12

ON/OFF

ON/OFF

°C

°C

or

INITIAL PREPARATION

Each meter is supplied complete with batteries.Remove the back cover, unwrap the batteries andinstall them while paying attention to polarity.

HI 9023C, HI 9024C, HI 9025C:

To prepare the instrument for use connect the pH electrode and thetemperature probe to the BNC and temperature sockets on the top ofthe instrument. The temperature probe can be used independently totake temperature measurements, or it can be used in conjunction withthe pH electrode to utilize the meter's ATC capability. If the probe isdisconnected, temperature can also be setmanually with the UP and DOWN keys. Toswitch the instrument on, press and hold theON/OFF key for a fraction of a second. Themeter has a built-in protection against electro-magnetic interference and the delayed responseof the keys assures that the commands are notmistaken for stray signals.

HI 9110 and HI 9210:

Connect the pH electrode to the BNC connector on the top of theinstrument and press the ON/OFF key.

HI 9210N and HI 9023CN:

Connect the pH/ C electrode to the DIN connector on the top ofthe instrument and press the ON/OFF key.

OPERATIONAL GUIDEOPERATIONAL GUIDEOPERATIONAL GUIDEOPERATIONAL GUIDEOPERATIONAL GUIDE

ON/OFF

13

°C

RANGEON/OFF

°C

°C

or

pH MEASUREMENTS

To take a pH measurement remove the elec-trode protective cap and simply submerge thetip (4cm/1½") of the electrode and the tem-perature probe (wherever applicable) into thesample to be tested.

Turn the instrument ON and if necessary, press RANGE until thedisplay changes to the pH mode.

Allow for the electrode to adjust to the solution and stabilize.

In order to take more accurate pH measurements, make sure thatthe instrument is calibrated (see page 16).

It is recommended that the electrode is always kept wet and rinsedthoroughly with the sample to be measured before use.

The pH reading is directly affected by temperature. In order for themeter to measure the pH accurately, temperature must be taken inconsideration. If the sample temperature is quite different from thetemperature at which the pH electrode was kept, allow a few minutesfor a perfect thermal equilibrium between them.

HI 9023C, HI 9024C and HI 9025C:

To use the meter's Automatic Temperature Compensation feature,submerge the temperature probe into the sample as close to theelectrode as possible and wait for a couple of minutes. If you know thetemperature of the sample to be tested you can manually compensatefor it.

If manual temperature compensation is desired the temperatureprobe must be disconnected from the instrument.

The display will show the default temperatureof 25�C or the last recorded temperature read-ing with the "�C" indicator blinking.

The temperature can now be adjusted with theUP and DOWN keys.

4 cm(1½

")

14

°C

RANGE

pH°C

SET

HI 9023C, HI 9023CN and HI 9210N

To use the meter's Automatic Temperature Compensation feature,simply submerge the pH/�C electrode into the sample and wait for acouple of minutes. The pH electrode also houses the temperaturesensor which will measure and adjust for the temperature effectautomatically.

HI 9110, HI 9210:

To use the meter’s Manual Temperature Compensation feature:

Press the pH/�C key of HI 9110 or the RANGE key of HI 9210 toselect the manual temperature mode.

Remove the protective cap on top of themeter to access the trimmers. Measure thetemperature of the buffer with a Checktempor an accurate thermometer.

Using the calibration screwdriver, turn thetemperature trimmer (#5 pages 9-10) todisplay the measured temperature value.

Press the pH/�C key of HI 9110 or the RANGE key of HI 9210 toreturn to the pH measurement mode.

When finished, switch the instrument off and rinse the electrodewith clean water. Pour a few drops of HI 70300 storage solution,or in its absence, pH 7 or pH 4 buffers in the protective cap andreplace it before storing away the electrode.

RANGE

pH°C

SET

15

ORP MEASUREMENTS (HI 9023C AND HI 9025C)

To enter the "mV" mode (ORP or ISE), turn the instrument ON andpress the RANGE key until the display changes to mV.

To measure the mV of a solution simplysubmerge the ORP or ISE electrode tip (4cm/1½") into the sample to be tested. Allow afew minutes for the readings to stabilize. Seealso "Taking REDOX Measurements" section atpage 29.

TEMPERATURE MEASUREMENTS (HI 9023C,HI 9023CN, HI 9024C, HI 9025C AND HI 9210N):Taking a temperature measurement is very easy. Turn the instrumentON and press the RANGE key to enter temperature mode.

For HI 9023C, HI 9024C and HI 9025C, dip the liquid/generalpurpose temperature probe HI 7669/2W into the sample. ForHI 9023CN and HI 9210N, simply dip the pH/�C electrode whichcontains the temperature sensor. Then allow a couple of minutes forthe reading to stabilize.

Note: You can also calibrate the offset point of the HI 9210N tem-perature sensor, if needed. For this purpose, immerse the pH/�C electrode in a solution at a known temperature. Then turnthe #5 trimmer (see page 10) until the temperature dis-played on the LCD is that of the solution.

ON/OFF

ON/OFF

4 cm(1½

")

RANGE

RANGE

16

It is recommended to calibrate the instrument frequently, especially ifhigh accuracy is required.

The instrument should be recalibrated for pH:

a) Whenever the pH electrode or temperature probe is replaced.

b) At least once a month.

c) After testing aggressive chemicals.

d) Whenever the batteries have been replaced.

e) If greater accuracy is required.

PREPARATIONPour small quantities of pH 7.01 and pH 4.01 solution into two cleanbeakers.

For accurate calibration use two beakers for each buffer solution, thefirst one for rinsing the electrode and the second one for calibration.This way contamination of buffer is minimized.

To obtain accurate readings, use pH 7.01 and pH 4.01 buffers if youare going to measure acidic samples, or pH 7.01 and pH 10.01 foralkaline measurements.

PROCEDURE FOR HI 9023C AND HI 9023CN:

• Make sure that the meter is in the pH mode.

• Remove the protective cap from the elec-trode, rinse it with some pH 7.01 solution,then immerse the pH electrode and tem-perature probe (HI 9023CHI 9023CHI 9023CHI 9023CHI 9023C) or the pH/�Celectrode (HI 9023CNHI 9023CNHI 9023CNHI 9023CNHI 9023CN) into pH 7.01 buffersolution and stir gently and wait for thereading to stabilize.

HI 7004 HI 7007

HI 7

004

HI 7007

CALIBRATION

HI 7007

RINSE

pppppH CALIBRATIONH CALIBRATIONH CALIBRATIONH CALIBRATIONH CALIBRATION

HI 7007

17

CFM

Note: The electrode should be submergedapproximately 4 cm (1½") into thesolution. With the temperature probelocated as close to it as possible (HIHIHIHIHI9023C9023C9023C9023C9023C).

• Press the CAL key. The temperature compensated pH value willblink on the display. For example, if the temperature is 25�C thereading will be pH 7.01. If the temperature is 20�C the reading

will be 7.03. The pH/temperature con-version chart is on page 24.

Note: If "E4" flashes, the buffer solution iswrong or the probe is defective (see page 25 for trouble-shooting).

• Wait for the "pH" symbol to stop flashing and press the CFM

key. The symbol "E5" will flash to indicate that the electrode isstill in the pH 7.01 buffer.

• Rinse the pH electrode (and the tem-perature probe) with distilled water firstand with the pH 4.01 (or 10.01) bufferafter.

• Dip the electrode (and the temperatureprobe) into the pH 4.01 (or 10.01) buffer solution. Stir gentlyand wait for the reading to stabilize.

• The "E5" symbol should disappear and the temperature com-pensated value will blink on the display.For example, if you are using pH 4.01 asthe buffer, the reading will be 4.01 at25�C.

• When the "pH" symbol stops flashing,press CFM to confirm the calibration.

The instrument is now calibrated and will remain calibrated even

CAL

HI 7004

CFM

4 cm(1½

")

18

°C

°C

or

°C

HI 7007

RANGE

ON/OFF

when it is turned off.

Note: The meter will lose the calibration ifthe batteries are removed.

HI 9023C only:

To calibrate with manual temperature com-pensation, follow this procedure:

• Disconnect the temperature probe andswitch the instrument ON.

• Press RANGE to select the temperaturemode.

• Place the pH electrode into the 7.01 bufferstir gently and wait for the LCD to stabilize.

• Record the buffer temperature by using a Checktemp C or an

accurate thermometer (e.g. 18�C).

• Press the UP and DOWN to adjust the temperature accordingly.

• Press RANGE to display pH and then press the CAL key. Thevalue of the buffer will be displayed.

• Wait for the "pH" symbol to stop flash-ing.

• Press CFM. The "E5" symbol will flashto indicate that the electrode is still inthe 7.01 solution.

RANGE CAL

and then

°C

CFM

HI 7004

19

• Rinse the electrode with clean or distilled water first and thenwith pH 4.01 (or 10.01) buffer. Dip the electrode into the pH

4.01 (or 10.01) solution and stir gently.

• Wait for the "pH" symbol to stop flashing. Press CFM toconfirm the calibration.

PROCEDURE FOR HI 9024C AND HI 9025C:In order to calibrate HI 9024C and HI 9025C, there is a choice of5 memorized buffers: 4.01, 6.86, 7.01, 9.18 and 10.01 pH.

• Make sure that the meter is in the pH mode.

• Remove the protective cap and rinse the electrode with some ofthe buffer calibration solution that you are going to use first.

ONE-POINT CALIBRATION:

It is always recommended to perform a two-point calibration foroptimum accuracy. In case of necessity, it is possible to carry out onlya one-point calibration with the instruments. The offset buffers, that isthe Standard 7.01 or the NIST 6.86 are themost appropriate for this purpose even thoughboth meters can be calibrated with any ofthe 5 memorized calibration solutions.

• Immerse the pH electrode into a pHbuffer solution (e.g. pH 6.86) and stirgently.

Note: The electrode should be submerged approximately 4 cm(1½") into the solution. With the temperature probe located

as close to it as possible.

CFM

CAL

1BUF

pH

°C

HI 7006

CAL

4 cm(1½

")

CAL

1BUF pH

20

• Once the electrode is submerged in thebuffer solution, the LCD will notify theuser if the reading is not stable by anintermittent "NOT READY". Only when thereading is stable, will it change to ablinking "READY" and "CON".

• Press the CFM key to confirm the calibra-tion. If the reading is not close to theselected buffer, "WRONG 1

BUF " and "WRONG

" will blink alternatively. If the reading isclose to the selected buffer, the meterstores the reading (and adjusts the offsetpoint). The buffer value is then displayedon the primary LCD and the secondaryLCD will display another buffer value(e.g."4.01").

• Press the CAL key and the calibration pro-cess is ended with only the offset of themeter calibrated. For best accuracy how-ever, do not press CAL and proceed with atwo-point calibration.

TWO-POINT CALIBRATION

After calibrating at 6.86 or 7.01 pH (see above), for the secondbuffer use pH 4.01 if you are going to measure acidic samples,and pH 9.18 or pH 10.01 if you are measuring alkaline solutions.

• Proceed as described in “One-point cali-bration above but do not end thecalibration by pressing CAL.

• After the first calibration point is con-firmed, immerse the pH electrode intothe second buffer solution (pH 4.01,9.18 or 10.01) and stir gently.

Note: The electrode should be submergedapproximately 4 cm (1½") into thesolution with the temperature probelocated as close to it as possible.

• Select the second buffer value on thesecondary display by pressing the °Cor C C C C C key.

NOT READY

READYCON

CFM

WRONGWRONG 1BUF

CAL

1BUF

pH

pH

CAL

HI 7004

4 cm(1½

")

°C

°C

or

21

Note: The electrode should be submergedapproximately 4 cm (1½") into thesolution with the temperature probelocated as close to it as possible.

• Select the second buffer value on the secondary display by

pressing the °C or �C�C�C�C�C key.

• When the “READY” and “CON” symbols blink on the display,the reading is stable and the calibration can be confirmed.

• Press the CFM key. If the reading is not close to the selected

buffer solution, “WRONG 2BUF ” and “WRONG ” will blinkalternatively. If the reading is close to the selected buffer, theslope and the offset are calibrated. The values will be stored inmemory and the meter will return to the operating mode.

Note: The meter will automatically skip the buffer that was usedfor the first calibration to avoid erroneous calibration. Atleast 1 full pH unit is required between the two buffers usedfor the offset and slope calibration. As a result, oncecalibrated at either pH 6.86 or 7.01, the microprocessor willautomatically ignore the other one for the second pointcalibration. It will do likewise for pH 9.18 and 10.01

Note: During calibration, the secondary LCD displays the selectedbuffer value. With HI 9025C, press the RANGE key to displaythe buffer temperature during calibration.

PROCEDURE FOR HI 9110, HI 9210 & HI 9210N:Manual Temperature Compensation

Note: The pH/�C electrode of HI 9210N incorporates a tempera-ture sensor which performs automatic temperature

compensation. Consequently, the following 5 paragraphsare irrelevant to HI 9210N and you can just proceed withpH calibration below.

READYCON

CFMWRONGWRONG

2BUF

pH°C

SET

RANGE°C

22

• Press pH/�C SET key for HI 9110 orthe RANGE key for HI 9210 to select themanual temperature setting. The "�C"symbol will be displayed to indicate thetemperature setting mode.

• Remove the protective cap on the top of the meter to haveaccess to the calibration trimmers.

• Record the temperature of the buffer with a Checktemp C oran accurate thermometer (e.g.20�C).

• Using the screwdriver, turn the temperature trimmer (# 5pages 9-10) to display the recorded temperature value.

• Press the pH/�C SET key for HI 9110or the RANGE key for HI 9210 to readpH.

pH Calibration

All three meters provide for manual pH cali-bration. As a result, you can performone or two point calibration at a bufferof your choice. The instructions belowexplain a typical calibration procedure atpH 7 and then 4 or 10.

• Remove the protective cap from the elec-trode, rinse it with some pH 7.01 solution, then dip in pH7.01 buffer. Stir briefly and wait for one minute for thereading to stabilize.

Note: The electrode should be submerged approximately 4 cm

°C

°C

pH°C

SET

RANGE

°C

HI 7007

pH

23

(1½") into the solution. For HI 9110 andHI 9210, place the thermometer closeto the pH electrode.

• Adjust the OFFSET trimmer (#3 pages 9-10) until the LCD shows the pH value atthe buffer temperature (see page 24 for pH values at varioustemperatures). With HI 9210N, press RANGE to read the buffertemperature.

• Rinse first with clean or distilled water and then with a smallamount of the next buffer (2nd calibration point). Dip theelectrode into pH 4.01 (or 10.01) buffer, stir gently and waituntil the display has stabilized.

• Adjust the SLOPE trimmer (#4 pages 9-10) until the LCDdisplays the pH value at the second buffer temperature (seepage 24).

• pH calibration is now complete. Once the calibration process iscomplete, replace the trimmer cover and tighten it to ensure aproper seal against water and humidity ingress.

pH

HI 7004

24

Temperature has an effect on pH. The calibration buffer solutions areaffected by temperature changes to a lesser degree than normalsolutions.

For manual temperature calibration (standard with HI 9110 andHI 9210 or optional with HI 9023C, HI 9024C and HI 9025C)please refer to the following chart.

For instance, if the buffer temperature is 25 C, the display shouldshow pH 4.01, 7.01 or 10.01 at pH 4, 7 or 10 buffers, respectively.

At 20 C, the display should show pH 4.00, 7.03 or 10.06. Themeter reading at 50 C will then be 4.06, 6.98 or 9.82.

pppppH VALUES AT VARIOUSH VALUES AT VARIOUSH VALUES AT VARIOUSH VALUES AT VARIOUSH VALUES AT VARIOUSTEMPERATURESTEMPERATURESTEMPERATURESTEMPERATURESTEMPERATURES

TEMP pH VALUES°C °F 4.01 6.86 7.01 9.18 10.010510152025303540455055606570

3241505968778695104113122131140149158

4.014.004.004.004.004.014.024.034.044.054.064.074.094.114.12

6.986.956.926.906.886.866.856.846.846.836.836.846.846.856.85

7.137.107.077.047.037.017.006.996.986.986.986.986.986.996.99

9.469.399.339.279.229.189.149.109.079.049.018.998.978.958.93

10.3210.2410.1810.1210.0610.019.969.929.889.859.829.799.779.769.75

25

TROUBLESHOOTING GUIDETROUBLESHOOTING GUIDETROUBLESHOOTING GUIDETROUBLESHOOTING GUIDETROUBLESHOOTING GUIDE

The meter is slow in re-sponding or gives faultyreadings

The meter does not ac-cept the 2nd buffersolution for calibration

The reading drifts

Display shows: "E1" or

Display shows: "E2" or

Display shows: "E3" or

Display shows: "E4" or"WRONG BUF 1 "and/or

"WRONG "

Display shows: "E5" or

"WRONG BUF

2 "

and/or

"WRONG "

The meter does notwork with the tempera-ture probe

The meter fails to cali-brate or gives faultyreadings

Display acts erratically

The electrode is notworking or the referencejunction is clogged

Out of order pH elec-trode

Out of order electrode

Out of range pH scale

Out of range tempera-ture scale

Out of range mV scale

Erroneous buffer solutionused for offset calibra-tion

Out of order electrode

Erroneous buffer solutionused for slope calibra-tion

Out of order electrode

Out of order temperatureprobe

Out of order pH elec-trode

The microprocessor hasbeen electronically dis-turbed

Leave the electrode in a stor-age solution after cleaningthe junction. If problem per-sists, replace the electrode

Follow the cleaning proce-dure. If this doesn't workreplace the electrode

Replace the pH electrode

a) Recalibrateb) Make sure the pH

sample is in the 0 to 14range

c) Check the electrolyte leveland the general state ofthe pH electrode

Make sure the temperatureis in the 0 to 100 C (or 70C) range and the probe isplugged in

Electrode not connected

Make sure the buffer settingis correct and the solution isfresh. Replace the buffer ifnecessary

Replace the pH electrode

Make sure the buffer settingis correct and the solution isfresh. Replace the buffer ifnecessary

Replace the pH electrode

Replace the probe

Replace the electrode

Remove one of the batter-ies for one minute to resetthe microprocessor

Symptoms Problem Solution

26

ELECTRODE CONDIT IONINGELECTRODE CONDIT IONINGELECTRODE CONDIT IONINGELECTRODE CONDIT IONINGELECTRODE CONDIT IONING& MAINTENANCE& MAINTENANCE& MAINTENANCE& MAINTENANCE& MAINTENANCE

PREPARATION

Remove the protective cap.DO NOT BE ALARMED IF ANY SALT DEPOSITS ARE PRESENT. This isnormal with electrodes and they will disappear when rinsed with water.During transport tiny bubbles of air may form inside the glass bulbaffecting proper functioning of the electrode. These bubbles can beremoved by "shaking down" the electrode as you would do with aglass thermometer.If the bulb and/or junction is dry, soak the electrode in HI 70300 orHI 80300 Storage Solution for at least one hour.

* Not present in gel electrodes.

27

For refillable electrodes:

If the filling solution (electrolyte) is more than 2½ cm (1") below thefill hole, add HI 7082 or HI 8082 3.5M KCl Electrolyte Solution fordouble junction or HI 7071 or HI 8071 3.5M KCl+AgCl ElectrolyteSolution for single junction electrodes.

For a faster response, unscrew the fill hole screw during measure-ments.

For AmpHel® electrodes:

If the electrode does not respond to pH changes, the battery is rundown and the electrode should be replaced.

MEASUREMENT

Rinse the electrode tip with distilled water. Immerse the tip (bottom 4cm /1½") in the sample and stir gently for a few seconds.

For a faster response and to avoid cross contamination of the samples,rinse the electrode tip with a few drops of the solution to be tested,before taking measurements.

STORAGETo minimize clogging and assure a quick response time, the glass bulband the junction should be kept moist and not allowed to dry out.

Replace the solution in the protective cap with a few drops of HI 70300or HI 80300 Storage Solution or, in its absence, Filling Solution(HI 7071 or HI 8071 for single junction or HI 7082 or HI 8082 fordouble junction electrodes). Follow the Preparation Procedure abovebefore taking measurements.

Note: NEVER STORE THE ELECTRODE IN DISTILLED OR DEIONIZED WA-TER.

PERIODIC MAINTENANCEInspect the electrode and the cable. The cable used for connection tothe meter must be intact and there must be no points of brokeninsulation on the cable or cracks on the electrode stem or bulb.Connectors must be perfectly clean and dry. If any scratches or cracksare present, replace the electrode. Rinse off any salt deposits withwater.

For refillable electrodes:

Refill the reference chamber with fresh electrolyte (HI 7071 or HI 8071for single junction or HI 7082 or HI 8082 for double junction elec-trodes). Allow the electrode to stand upright for 1 hour.

Follow the Storage Procedure above.AmpHel® is a registered Trademark of "Hanna Instruments"

28

CLEANING PROCEDURE

General Soak in Hanna HI 7061 or HI 8061 General Clean-ing Solution for approximately ½ hour.

Removal of films, dirt or deposits on the membrane/junction:

- Protein Soak in Hanna HI 7073 or HI 8073 Protein Clean-ing Solution for 15 minutes.

- Inorganic Soak in Hanna HI 7074 or HI 8074 Inorganic Clean-ing Solution for 15 minutes.

- Oil/grease Rinse with Hanna HI 7077 or HI 8077 Oil and FatCleaning Solution.

IMPORTANT: After performing any of the cleaning proceduresrinse the electrode thoroughly with distilled water, refill the refer-ence chamber with fresh electrolyte (not necessary for gel-filledelectrodes) and soak the electrode in HI 70300 or HI 80300Storage Solution for at least 1 hour before taking measurements.

TROUBLESHOOTING

Evaluate your electrode performance based on the following.

• Noise (Readings fluctuate up and down) could be due to:

– Clogged/Dirty Junction: Refer to the Cleaning Procedureabove.

– Loss of shielding due to low electrolyte level (in refillableelectrodes only): refill with fresh HI 7071 or HI 8071 forsingle junction or HI 7082 or HI 8082 for double junctionelectrodes.

• Dry Membrane/Junction: Soak in HI 70300 or HI 80300Storage Solution for at least 1 hour.

• Drifting: Soak the electrode tip in warm (approx. 50-60�C)Hanna HI 7082 or HI 8082 Solutions for one hour and rinsethe tip with distilled water. Refill with fresh HI 7071 orHI 8071 for single junction electrodes and HI 7082 or HI 8082for double junction electrodes (refillable electrodes only).

• Low Slope: Refer to the cleaning procedure above.

• No Slope: Check the electrode for cracks in glass stem or bulband replace the electrode.

• Slow Response/Excessive Drift: Soak the tip in HI 7061 orHI 8061 Solutions for 30 minutes, rinse thoroughly in distilledwater and then follow the Cleaning Procedure above.

29

TAKING REDOX MEASUREMENTS(HI 9023C & HI 9025C only)

HI 9023C and HI 9025C have the capability to take ORP measure-ments. An optional ORP electrode must be used to perform thesemeasurements.

Oxidation-Reduction Potential (REDOX) measurements provide thequantification of the oxidizing or reducing power of the sampletested.

To correctly perform a redox measurement, the surface of the ORPelectrode must be clean and smooth.

In order to improve performance and obtain a faster responsetime, precondition your ORP electrode with reducing or oxidizingsolutions.Generally speaking, if the ORP mV reading corresponding to the pHvalue of the solution is higher than the values in the table below,an oxidizing pretreatment is necessary; otherwise a reducingpretreatment is necessary:

pH mV pH mV pH mV pH mV pH mV

0 990 1 920 2 860 3 800 4 740

5 680 6 640 7 580 8 520 9 460

10 400 11 340 12 280 13 220 14 160

Reducing pretreatment: immerse the electrode for a few minutes inHI 7091.

Oxidizing pretreatment: immerse the electrode for a few minutes inHI 7092.

When not in use, the tip of the electrode should be kept moist andsafe from any mechanical stress which might cause damage to theglass/platinum junction.

30

If the batteries become weak:

- HI 9023C and HI 9023CN will display ablinking additional decimal point.

- HI 9024C and HI 9025C will display"LOW BAT".

- HI 9110, HI 9210 and HI 9210N willdisplay a "V" on the LCD. Note: HIHIHIHIHI91109110911091109110, HI 9210HI 9210HI 9210HI 9210HI 9210 and HI 9210NHI 9210NHI 9210NHI 9210NHI 9210N aresupplied with the advanced "BEPS", Bat-tery Error Preventive System, that detects a low voltage conditionin the battery. The "V" symbol is to alert the user that thedisplay will be shut-off after about 5 hours of use. After that,the meter shuts down the display, preventing the taking oferroneous measurements due to low voltage.

Battery replacement must only take place in anon hazardous area using the battery typesspecified in this instruction manual. To re-place rundown batteries, remove the twoscrews on the rear cover of the instrumentand replace all four 1.5V AA batteries withnew ones, while paying attention to thecorrect polarity. Replace the cover and tightenthe two screws. The meter is reset any timethe batteries are removed. In case of anyfunctional problems, reset the meter by removing and reinstallingthe batteries.

pH

LOW BAT

V

BATTERY REPLACEMENT & AUTO-OFFBATTERY REPLACEMENT & AUTO-OFFBATTERY REPLACEMENT & AUTO-OFFBATTERY REPLACEMENT & AUTO-OFFBATTERY REPLACEMENT & AUTO-OFF

31

ACCESSORIESACCESSORIESACCESSORIESACCESSORIESACCESSORIES

pH CALIBRATION SOLUTIONSHI 70004P pH 4.01 Buffer Sachets, 20mL, 25 pcsHI 70007P pH 7.01 Buffer Sachets, 20mL, 25 pcsHI 70010P pH 10.01 Buffer Sachets, 20mL, 25 pcsHI 7004L pH 4.01 Buffer Solution, 460 mLHI 7006L pH 6.86 Buffer Solution, 460 mLHI 7007L pH 7.01 Buffer Solution, 460 mLHI 7009L pH 9.18 Buffer Solution, 460 mLHI 7010L pH 10.01 Buffer Sol., 460 mL

pH CALIBRATION SOLUTIONS IN FDA APPROVEDBOTTLEHI 8004L pH 4.01 Buffer Solution, 460 mLHI 8006L pH 6.86 Buffer Solution, 460 mLHI 8007L pH 7.01 Buffer Solution, 460 mLHI 8009L pH 9.18 Buffer Solution, 460 mLHI 8010L pH 10.01 Buffer Solution, 460 mL

ELECTRODE STORAGE SOLUTIONHI 70300L Storage Solution, 460 mLHI 80300L Storage Solution in a FDA approved bottle, 460 mL

ELECTRODE CLEANING SOLUTIONSHI 70000P Electrode Rinse Sachets, 20 mL, 25 pcsHI 7061L General Cleaning Sol., 460 mLHI 7073L Protein Cleaning Sol., 460mLHI 7074L Inorganic Cleaning Sol., 460mLHI 7077L Oil & Fat Cleaning Sol.,460 mL

ELECTRODE CLEANING SOLUTIONS IN FDAAPPROVED BOTTLESHI 8061L General Cleaning Solution, 460 mLHI 8073L Protein Cleaning Solution, 230 mLHI 8077L Oil & Fat Cleaning Solution, 460mL

REFILL ELECTROLYTE SOLUTIONSHI 7071 3.5M KCl + AgCl Electrolyte, 4x50mL, for single

junction electrodesHI 7072 1M KNO

3 Electrolyte, 4x50 mL

HI 7082 3.5M KCl Electrolyte, 4x50 mL, for double junctionelectrodes

32

REFILL ELECTROLYTE SOLUTIONS IN FDA APPROVEDBOTTLESHI 8071 3.5M KCl + AgCl Electrolyte, 4x50mL, for single

junction electrodesHI 8072 1M KNO

3 Electrolyte, 4x50 mL

HI 8082 3.5M KCl Electrolyte, 4x50 mL, for double junctionelectrodes

ORP PRETREATMENT SOLUTIONSHI 7091L Reducing Pretreatment Solution, 460 mLHI 7092L Oxidizing Pretreatment Solution, 460 mL

pH & ORP ELECTRODES

All electrodes part numbers ending in B are supplied with a BNCconnector and 1 m (3.3') cable, as shown below:

HI 1043B

Glass-body, double junction, refillable, combination pH electrode.Use: strong acid/alkali.

HI 1053B

Glass-body, triple ceramic, conic shape, refillable, combination pHelectrode. Use: emulsions.

120 mm4.7"

12 mm0.5"

9.5mm DIA0.37"

"S" VERSION

HI 1043

120 mm4.7"

12 mm0.5"

"S" VERSION

HI 1053

33

HI 1083B

Glass-body, micro, Viscolene, non-refillable, combination pH elec-trode. Use: biotechnology, micro titration.

HI 1131B

Glass-body, single junction, refillable, combination pH electrode.Use: general purpose.

120 mm4.7"

12 mm0.5" 5 mm

0.2"3 mm0.12" 3.0 mm DIA

0.12"

HI 1083

120 mm4.7"

12 mm0.5"

9.5mm DIA0.37"

"S" VERSION

HI 1131

HI 1330B

Glass-body, semimicro, single junction, refillable, combination pHelectrode. Use: laboratory, vials.

HI 1331B

Glass-body, semimicro, single junction, refillable, combination pHelectrode. Use: flasks.

HI 1230B

Plastic-body (Ultem®), double junction, gel-filled, combination pHelectrode. Use: general, field.

120 mm4.7"

5mm0.2"

5mm DIA0.2"

"S" VERSION

HI 1330

210 mm8.25"

8 mm0.3"

7.5mm DIA0.29"

"S" VERSION

HI 1331

120 mm4.7"

12 mm0.5"

"S" VERSION

HI 1230

34

HI 2031B

Glass-body, semimicro, conic, refillable, combination pH electrode.Use: semisolid products.

HI 1332B

Plastic-body (Ultem®), double junction, refillable, combination pHelectrode. Use: general purpose.

75 mm2.95"

6 mm0.25"

"S" VERSION

HI 2031

120 mm4.7"

12 mm0.5"

"S" VERSION

HI 1332

FC 100B

Plastic-body (Kynar®), double junction, refillable, combination pHelectrode. Use: general purpose for food industry.

FC 200B

Plastic-body (Kynar®), open junction, conic, Viscolene, non-refill-able, combination pH electrode. Use: meat & cheese.

120 mm4.7"

12 mm0.5"

FC 100

75 mm2.95"

6 mm0.25"

FC 200

35

120 mm4.7"

12 mm0.5"

FC 210

120 mm4.7"

12 mm0.5"

9.5mm DIA0.37"

FC 220

FC 210B

Glass-body, double junction, conic, Viscolene, non-refillable, combi-nation pH electrode. Use: milk, yogurt.

FC 220B

Glass-body, triple-ceramic, single junction, refillable, combinationpH electrode. Use: food processing.

FC 911B

Plastic-body (Kynar®), double junction, refillable with built-inamplifier, combination pH electrode. Use: very high humidity.

HI 1413B

Glass-body, single junction, flat tip, Viscolene, non-refillable, combi-nation pH electrode. Use: surface measurement.

110 mm4.3"

12 mm0.5"

FC 911

110 mm4.3"

12 mm0.5"

HI 1413

Kynar® is registered Trademark of "Pennwalt Corp."

Ultem® is registered Trademark of "General Electrics Co."

36

ORP electrodes:

HI 3131B

Glass-body, refillable, combination platinum ORP electrode. U s e :titration.

HI 3230B

Plastic-body (Ultem®), gel-filled, combination platinum ORP elec-trode. Use: general purpose.

HI 4430B

Plastic-body (Ultem®), gel-filled, combination gold ORP electrode.Use: general purpose.

150 mm5.9"

12 mm0.5"

"S" VERSION

HI 3131

120 mm4.7"

12 mm0.5"

HI 3230

"S" VERSION

120 mm4.7"

12 mm0.5"

HI 4430

"S" VERSION

Consult the Hanna General Catalog for an extensive selection ofelectrodes.

OTHER ACCESSORIES

ChecktempC Pocket-size thermometer (range -50.0 to 150.0�C)HI 76405 Electrode holderHI 7669/2W Temperature probe with 1 m (3.3') screened cable

(not HI 9110, HI 9210, HI 9210N and HI 9023CN)HI 8427 pH and ORP electrode simulator with 1 m (3.3')

coaxial cable ending in female BNC connectorsHI 931001 pH and ORP electrode simulator with LCD and 1 m

(3.3') coaxial cable ending in female BNC connec-tors

HI 721317 Rugged carrying case

37

Application Electrodes *

1. Aquarium HI 1332B

2. Bath-water HI 1130B

3. Beer HI 1131B

4. Bread HI 2031B, FC 200B

5. Cheese FC 200B

6. Dairy products FC 100B

7. Dirty water HI 1230B

8. Emulsions HI 1053B

9. Environment HI 1230B

10. Flasks HI 1331B

11. Food industry general use FC 911B, FC 100B

12. Fruit FC 200B, FC 220B

13. Fruit juices, organic FC 210B

14. Galvanizing waste solution HI 1130B

15. Heavy-duty applications HI 1135B

16. High purity water HI 1053B

17. Horticulture HI 1053B, FC 200B

18. Laboratory general use HI 1131B, HI 1230B, HI 1332B, HI 1330B

19. Leather HI 1413B

20. Lemon juice FC 100B

21. Meat FC 200B, HI 2031B

22. Micro plate sampling of less than HI1083B100 mL

23. Milk and Yogurt FC 210B

24. Paints HI 1053B

25. Paper HI 1413B

26. Photographic chemicals HI 1230B

27. Quality control HI 1332B

28. Sausages FC 200B, HI 2031B

29. Semisolid products HI 2031B

30. Skin HI 1413B

31. Soil samples HI 1230B

32. Solvents HI 1043B

33. Strong acid HI 1043B

34. Submersion application HI 1130B

35. Surface measurements HI 1413B

36. Swimming pool H I1130B, HI 2114P/2

37. Titrations with constant HI 1131Btemperature range

38. Titrations with wide temperature HI 1131Brange

39. Very high humidity FC 911B

40. Vials and test tube HI 1330B

41. Wine processing FC 220B

ELECTRODE APPLICATIONELECTRODE APPLICATIONELECTRODE APPLICATIONELECTRODE APPLICATIONELECTRODE APPLICATIONREFERENCE GUIDEREFERENCE GUIDEREFERENCE GUIDEREFERENCE GUIDEREFERENCE GUIDE

* All electrode listed are supplied with 1m (3") cable and BNCconnector.

38

WARRANTYWARRANTYWARRANTYWARRANTYWARRANTY

All Hanna Instruments meters are guaranteed for two yearsagainst defects in workmanship and materials when used for theirintended purpose and maintained according to instructions. Theelectrodes and the probes are guaranteed for a period of sixmonths. This warranty is limited to repair or replacement free ofcharge.

Damage due to accident, misuse, tampering or lack of prescribedmaintenance are not covered.

If service is required, contact the dealer from whom you purchasedthe instrument. If under warranty, report the model number, dateof purchase, serial number and the nature of the failure. If therepair is not covered by the warranty, you will be notified of thecharges incurred. If the instrument is to be returned to HannaInstruments, first obtain a Returned Goods Authorization numberfrom the Customer Service department and then send it withshipping costs prepaid. When shipping any instrument, make sureit is properly packaged for complete protection.

To validate your warranty, fill out and return the enclosed war-ranty card within 14 days from the date of purchase.

All rights are reserved. Reproduction in whole or in part isprohibited without the written consent of the copyright owner,Hanna Instruments Inc., 584 Park East Drive, Woonsocket, RhodeIsland, 02895 , USA.

Hanna Instruments reserves the right to modify the design,construction and appearance of its products without advancenotice.

39

Recommendations for Users

Before using these products, make sure that they are entirely suitable for the environment in which they areused.

Operation of these instruments in residential area could cause unacceptable interference to radio and TVequipment, requiring the operator to take all necessary steps to correct interference.

The glass bulb at the end of the electrode is sensitive to electrostatic discharges. Avoid touching this glassbulb at all times.

During calibration of instruments, ESD wrist straps should be worn to avoid possible damage to the electrodeby electrostatic discharge.

To maintain the EMC performance of equipment, the recommended cables noted in the user's manual mustbe used.

In particular cases the instruments could turn off. In such cases, turn them on by pressing the ON/OFFkey.

Any variation introduced by the user to the supplied equipment may degrade the instruments' EMCperformance.

To avoid electrical shock, do not use these instruments when voltages at the measurement surface exceed 24VACor 60VDC.

To avoid damage or burns, do not perform any measurement in microwave ovens.

CE DECLARATION OF CONFORMITYCE DECLARATION OF CONFORMITYCE DECLARATION OF CONFORMITYCE DECLARATION OF CONFORMITYCE DECLARATION OF CONFORMITY HANNA L ITERATUREHANNA L ITERATUREHANNA L ITERATUREHANNA L ITERATUREHANNA L ITERATURE

MANPHWPR3

02/00

Hanna publishes a wide range of catalogs and hand-books for an equally wide range of applications.The reference literature currently covers areas such as:

• Water Treatment• Process• Swimming Pools• Agriculture• Food• Laboratory• Thermometry

and many others. New reference material is constantlybeing added to the library.

For these and other catalogs, handbooks and leaflets,contact your dealer or the Hanna Customer ServiceCenter nearest to you. To find the Hanna Office inyour vicinity, check our home page atwww.hannainst.com.